Create remote git repo on msslae:
[mcrw@msslae ~/git]$ mkdir LibCcsds.git
[mcrw@msslae ~/git]$ cd LibCcsds.git/
[mcrw@msslae LibCcsds.git]$ git --bare init
Initialized empty Git repository in /disk/home/mcrw/git/LibCcsds.git/
[mcrw@msslae LibCcsds.git]$ cd ..
[mcrw@msslae ~/git]$ pwd
/disk/home/mcrw/git

On Mac mini make everything up to date (commit, merge), then
(base) mcrw@Sirenia ~/lib/perl5 $ cd LibCcsds
(base) mcrw@Sirenia ~/lib/perl5/LibCcsds (master) $ pwd
/Users/mcrw/lib/perl5/LibCcsds
(base) mcrw@Sirenia ~/lib/perl5/LibCcsds (master) $ git push mcrw@msslae.mssl.ucl.ac.uk:/disk/home/mcrw/git/LibCcsds master
or, if you have a branch which is good:
(base) mcrw@Sirenia ~/lib/perl5/LibCcsds (master) $ git push mcrw@msslae.mssl.ucl.ac.uk:/disk/home/mcrw/git/perl5/LibCcsds +branch:master
(base) mcrw@Sirenia ~/lib/perl5/LibCcsds (master) $ git push mcrw@msslae.mssl.ucl.ac.uk:/disk/home/mcrw/git/perl5/LibCcsds —-set-upstream origin branch

Note:
If you will be pushing regularily to the remote repo, it's probably a good advice to git remote add origin ssh://my_host/new_repo. This way you' just do a git push origin [branchname]

Now we can clone the new repo:
(iwsop) mcrw@Sirenia ~/git $ pwd
/Users/mcrw/git
(iwsop) mcrw@Sirenia ~/git $ git clone mcrw@msslae.mssl.ucl.ac.uk:/disk/home/mcrw/git/perl5/LibCcsds.git
Cloning into 'LibCcsds'...
remote: Counting objects: 40, done.
remote: Compressing objects: 100% (36/36), done.
remote: Total 40 (delta 18), reused 0 (delta 0)
Receiving objects: 100% (40/40), 16.26 KiB | 272.00 KiB/s, done.
Resolving deltas: 100% (18/18), done.
(iwsop) mcrw@Sirenia ~/git $ cd LibCcsds/

git pull

[mcrw@msslae ~]$ ls -l git
drwxr-xr-x 11 mcrw xray 11 Dec 10 10:10 IDL
drwxr-xr-x  4 mcrw xray  4 May 14  2020 java
drwxr-xr-x  8 mcrw xray  8 Dec 10 12:17 perl5
drwxr-xr-x  9 mcrw xray  9 Dec 10 12:02 python3
drwxr-xr-x  7 mcrw xray 10 May  2  2020 RickUmaliVanityWebsite.git
drwxr-xr-x  3 mcrw xray  3 Apr 19 14:43 tcl

[mcrw@msslae ~/git]$ ls -l IDL
drwxr-xr-x 7 mcrw xray 10 May  2  2020 base.git
drwxr-xr-x 7 mcrw xray 10 May  2  2020 ccsds.git
drwxr-xr-x 7 mcrw xray 10 May  2  2020 decompression.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 10:05 eis_mission_data.git
drwxr-xr-x 2 mcrw xray  2 May 14  2020 eis_mission_data_reformatter.git
drwxr-xr-x 2 mcrw xray  2 May 14  2020 eis_status_reformatter.git
drwxr-xr-x 2 mcrw xray  2 May 14  2020 logger.git
drwxr-xr-x 2 mcrw xray  2 May 14  2020 pipeline.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 10:10 sys_if.git

[mcrw@msslae ~/git]$ ls -l perl5/
drwxr-xr-x 2 mcrw xray  2 May 14  2020 Astro.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:09 Base.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:09 Fits.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:09 Graphics.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:18 Hinode.git
drwxr-xr-x 7 mcrw xray 10 May  2  2020 LibCcsds.git

[mcrw@msslae ~/git]$ ls -l python3/
drwxr-xr-x 7 mcrw xray 10 Dec 10 11:40 Base.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:02 CCSDS.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:02 Hinode.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:03 Logger.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:03 Pipeline.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:03 PyCcsds.git
drwxr-xr-x 7 mcrw xray 10 Dec 10 12:03 PyFits.git

[mcrw@msslae ~/git]$ ls -l java/
drwxr-xr-x 2 mcrw xray 2 May 14  2020 Ccsds.git
drwxr-xr-x 5 mcrw xray 5 May 14  2020 Hinode

[mcrw@msslae ~/git]$ ls -l java/Hinode/
total 2
drwxr-xr-x 2 mcrw xray 2 May 14  2020 Ccsds
drwxr-xr-x 2 mcrw xray 2 May 14  2020 Mission.git
drwxr-xr-x 2 mcrw xray 2 May 14  2020 Status.git

[mcrw@msslae ~/git]$ ls -l tcl
total 1
drwxr-xr-x 5 mcrw xray 5 Apr 19 14:48 lib

[mcrw@msslae tcl]$ cd lib
[mcrw@msslae lib]$ ls -l
total 18
drwxr-xr-x 7 mcrw xray 10 Apr 19 14:46 Base.git
drwxr-xr-x 7 mcrw xray 10 Apr 19 14:46 Ccsds.git
drwxr-xr-x 3 mcrw xray  3 Apr 19 14:48 Hinode

[mcrw@msslae lib]$ ls -l Hinode/
total 1
drwxr-xr-x 3 mcrw xray 3 Apr 19 14:48 EIS

[mcrw@msslae lib]$ ls -l Hinode/EIS/
total 9
drwxr-xr-x 7 mcrw xray 10 Apr 19 14:48 EisMissionData.git