You have a few choices:
-
Minecraft launcher (official) - Allows you to play vanilla MC.
-
Prisim launcher - allows you to download & play mod packs from several sources (newer FTB packs have to be loaded up in the FTB app first before being imported).
-
FTB app - allows you to play basically any FTB modpack.
The first should show up in the software store and the second two have install instructions on their websites.
I use Timeshift to backup my SSD to a HDD then I use Lucky backup to (oneway) sync my main folders (doc, music, download, pic, videos, etc) to a USB HDD.
Still need to figure out how to do an encrypted backup to cloud storage (thanks to 90% of common cloud storage is based in the USA with very loose data protection laws).