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I have my cloud backup with Onlime and I am very happy with it. Easy to maintain and easy to work with on both my computer and mobile.
CostStorage - Super simple cloud storage pricing estimator
Google Drive - Access and sync your files anywhere
Backblaze B2 Cloud Storage - The lowest cost cloud storage on the planet: $0.005/GB/Month
CloudMounter - CloudMounter for Mac OS X: map Dropbox as network drive, mount OneDrive, Google Drive and Amazon S3; FTP client and WebDAV client.
Jottacloud - Safe cloud storage
Cryptee - Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.