Add way to backup data either locally or to Google Drive

[ShamblesSM]

Paimon.moe/Pom.moe/SRS have a way to do this, perhaps if GDrive backup cannot be implemented yet than at the very least do local backups

[alpharmi]

Backing up data is planned, just have other things I plan to do beforehand.

I haven't heard of Wuthering Waves clearing gacha history after a certain time period unlike mihoyo's 6 months so there isn't a big incentive right now besides people accidently clearing it themselves.