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File/Folder Limitations of 1&1 Online Storage

Maximum number of folders and files in 1&1 Online Storage
To guarantee trouble-free operation of your 1&1 Online Storage, the number of folders and files in your complete 1&1 Online Storage is limited to 300,000.
Maximum number of files and/or folders in one folder
To guarantee trouble-free operation of your 1&1 Online Storage, the number of folders and files in one folder is limited to 1,000.
Maximum path length for folder and file names
When assigning folder and file names, observe the maximum path length restriction of 255 characters.
Illegal non-standard characters in folder and file names
When assigning folder and file names, note that you cannot use the following non-standard characters:
? > |* < : " \ / +
Maximum size for uploaded files
When uploading files, make sure you do not exceed the maximum file size limit of 2 GB.