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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.
Backblaze B2 Cloud Storage - The lowest cost cloud storage on the planet: $0.005/GB/Month
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Google Drive - Access and sync your files anywhere
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Dolpin - Decentralized & Encrypted Cloud Storage
Standard Notes - A safe place for your notes, thoughts, and life's work