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Each newsgroup is generally allocated a certain amount of storage space for post content. When this storage has been filled,[link widoczny dla zalogowanych] each time a new post arrives, old posts are deleted to make room for the new content. If the network bandwidth available to a server is high but the storage allocation is small, it is possible for a huge flood of incoming content to overflow the allocation and push out everything that was in the group before it. If the flood is large enough, the beginning of the flood will begin to be deleted even before the last part of the flood has been posted.
Binary newsgroups are only able to function reliably if there is sufficient storage allocated to a group to allow readers enough time to download all parts of a binary posting before it is flushed out of the group's storage allocation. This was at one time how posting of undesired content was countered; the newsgroup would be flooded with random garbage data posts, of sufficient quantity to push out all the content to be suppressed.[link widoczny dla zalogowanych] This has been compensated by service providers allocating enough storage to retain everything posted each day, including such spam floods, without deleting anything.
The average length of time that posts are able to stay in the group before being deleted is commonly called the? retention time. Generally the larger usenet servers have enough capacity to archive several weeks of binary content even when flooded with new data at the maximum daily speed available. A good binaries service provider must not only accommodate users of fast connections (3 megabit) but also users of slow connections (256 kilobit or less) who need more time to download content over a period of several days or weeks.
ISP-operated Usenet servers frequently block access to all alt.binaries.* groups to both reduce network traffic and to avoid related legal issues. Commercial Usenet service providers claim to operate as a telecommunications service, and assert that they are not responsible for the user-posted binary content transferred via their equipment. In the United States,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych] Usenet providers can qualify for protection under the DMCA Safe Harbor regulations, provided that they establish a mechanism to comply with and respond to takedown notices from copyright holders.