Google Photos will back up unlimited quantity photos and videos with a cap on quality:
Back up unlimited photos and videos for free, up to 16MP and 1080p HD.
Access them from any phone, tablet, or computer on photos.google.com –
your photos will be safe, secure, and always with you.
Amazon Photos: If you have Amazon Prime, Amazon ...
Nextcloud is an open-source alternative to google drive. The software is free but it is self-hosted. Registered users can also sync documents shared with them.
✔️ Allow visitors to upload, download files, create folders and move files between folders, but restrict them from delete files
✔️ Be recoverable if something goes wrong
✔️ Visitors can view without ...