Your most important item is - get a copy of the backup off the card in case the card dies - you have the copy.
Backups live in \\[host]\backup. They’re .tar files therefore any extraction tool that can open a tarball should be able to see inside.
(I’m assuming your install type is HAOS so Addons are available)
I use a tool to get the backup and copy it for me - Google Drive Backup Addon:
Add-on: Home Assistant Google Drive Backup - Installation / Home Assistant OS - Home Assistant Community (home-assistant.io)
You may also use something like the SAMBA backup Add-on. Basically the same idea - just moving it to a SAMBA (read: SMB, local file server) share. (If you have a NAS, or something similar)
Samba Backup: Create and store backups on a Samba share - Share your Projects! - Home Assistant Community (home-assistant.io)