Para Wodna Sync is (at least tries to be) a cloud save management tool for RetroArch.
With PW Sync you can easily synchronize your retro game saves between supported platforms:
• PS Vita | ❗
• Linux | ❗
• Windows | ❌
• Raspberry Pi | ❌
• Android | ❌
There's also a GUI available. You should definitely check it out.