A tip for Gmail Keeper users:
When doing the backup, the current version of Gmail Keeper saves each email as an individual .eml file to a temporary disk folder, before moving them to the final .zip archive – so that means a lot of small files being created and deleted.
If you have an AV software monitoring your disk in real-time, it might significantly slow down the backup process. try temporarily disable the real-time protection option (if luckily there is a such option).
BTW, some reported strange problems, such as failing to compress the .eml files, etc, are also caused by the real-time file protection of the AV software.
PS: I’m behind my schedule of developing the new version of Gmail Keeper, sorry…