Linux Mint Forums

Yes. Simply copy the contents of /var/cache/apt/archives (that's where all your updates and additions are cached) onto a flash drive (or something) and copy the files back to the same location after you reinstall. I do this all the time to keep 2 machines updated without using too much bandwidth. The fun part is taking the laptop to someplace with free fast wifi and doing the updates, thereby keeping my bandwidth cap at home under control.

BTW, this basic process is possible with all versions of linux - with varying degrees of difficulty. Yet another reason it's superior to mainstream OS's.

I haven't done this personally but if you put them back in that cache folder just run from console
It's the same command you would normally use to update but it should check the cache folder first before downloading anything new.

weirddan has it exactly right - packages in the cache folder will be used rather than downloaded again. This is true no matter which method you use to update (Mintupdate, Synaptic, Software Centre or command line apt-get).

First ,copy files in /var/cache/apt/archives ( don't copy partial folder and lock file) to your home folder , create folder ( example master deb ) and paste to it

I always this method to install update to all my machine ,with certain condition:
-open source driver in use, example if one your machine used proprietary NVIDIA driver but another one using intel, you must remove nvidia package first.
-same desktop environment. Cinnamon , kde , mate have different specific file.
- if you are using different DE, you can run update manager and compare file in update manager to master deb folder , remove file which not listed in update manager list. ( this is vey annoying to me )
Than , use synaptic package manager . click file>add downloaded package , point it to master deb folder.